QStandardItemModel with QIdentityProxyModel

[yagabey]

Hi , i have a problem with QStandardItemModel and QIdentityProxyModel.

I've implemented a QIdentityProxyModel to be able to change the way of displaying the model. Here is the data() function of QIdentityProxyModel :

QVariant data(const QModelIndex &index, int role) const
{
        if (role == Qt::DisplayRole && index.column() == AlarmLogViewIndex_RecovTime){
            qDebug()<<  sourceModel()->data(index);
            qint64 sinceEpoch = sourceModel()->data(index).toLongLong();
            const QDateTime dateTime = QDateTime::fromMSecsSinceEpoch(sinceEpoch);
 
            return dateTime.toString(m_formatString);
            }
}

QVariant data(const QModelIndex &index, int role) const
{
        if (role == Qt::DisplayRole && index.column() == AlarmLogViewIndex_RecovTime){
            qDebug()<<  sourceModel()->data(index);
            qint64 sinceEpoch = sourceModel()->data(index).toLongLong();
            const QDateTime dateTime = QDateTime::fromMSecsSinceEpoch(sinceEpoch);

            return dateTime.toString(m_formatString);
            }
}

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This works like a charm when source model is a QSqlTableModel. But i need to use the same QIdentityProxyModel for a QStandardItemModel. When i use standartItemModel as the source of QIdentityProxyModel , i get QVariant(Invalid) values from the above data() function (in qDebug output...) . I was suspicious about the way i created the StandardItemModel. But it works well without the QIdentityProxyModel .

Here is how i implement the StandardItemModel,

adding a row to the model:

void TagChannelItemModel::addToTagModel(pEtiketDef_t tg)
{
    int row = tagModel->rowCount();
 
    QStandardItem* item = new QStandardItem(QString::number(tg.Id));
    tagModel->setItem(row, TgIndex_Id, item);
 
    item = new QStandardItem(tg.Name);
    tagModel->setItem(row, TgIndex_Name, item);
 
    item = new QStandardItem(QString::number(tg.PollFrequency));
    tagModel->setItem(row, TgIndex_PollFreq, item);
}

void TagChannelItemModel::addToTagModel(pEtiketDef_t tg)
{
    int row = tagModel->rowCount();

    QStandardItem* item = new QStandardItem(QString::number(tg.Id));
    tagModel->setItem(row, TgIndex_Id, item);

    item = new QStandardItem(tg.Name);
    tagModel->setItem(row, TgIndex_Name, item);

    item = new QStandardItem(QString::number(tg.PollFrequency));
    tagModel->setItem(row, TgIndex_PollFreq, item);
}

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Should i do anything else for this item model to work with ProxyModel ?

Thanks in advance...